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T-ray computed tomography.

Bradley Ferguson, Shaohong Wang, Doug Gray

    Optics Letters
    |November 21, 2007
    PubMed
    Summary
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    We developed terahertz-wave computed tomography (T-ray CT) for 3D imaging. This technique uses pulsed terahertz radiation to reveal the optical properties of 3D structures in the far-infrared spectrum.

    Area of Science:

    • Physics
    • Optical Engineering
    • Materials Science

    Background:

    • Conventional computed tomography (CT) techniques, like X-ray CT, are widely used for imaging.
    • Terahertz (THz) radiation offers unique capabilities for probing material properties in the far-infrared spectrum.
    • There is a need for non-ionizing imaging modalities capable of characterizing 3D structures and their optical properties.

    Purpose of the Study:

    • To demonstrate a novel tomographic imaging modality using pulsed terahertz radiation.
    • To develop a system for probing the optical properties of three-dimensional (3D) structures in the far-infrared.
    • To reconstruct both the 3D structure and frequency-dependent optical properties of objects.

    Main Methods:

    • Utilizing pulsed terahertz (THz) radiation for imaging.

    Related Experiment Videos

  • Employing a computed tomography (CT) approach, termed THz-wave computed tomography (T-ray CT).
  • Measuring the transmitted amplitude and phase of broadband THz pulses at multiple projection angles.
  • Applying a filtered backprojection algorithm for image reconstruction.

    • Main Results:

    • Successful demonstration of a tomographic imaging modality using THz radiation.
    • Generation of sectional images analogous to conventional CT techniques.
    • Reconstruction of 3D structures and their frequency-dependent far-infrared optical properties.

    Conclusions:

    • THz-wave computed tomography (T-ray CT) is a viable method for 3D imaging.
    • This modality can characterize both the physical structure and optical properties of objects.
    • The technique provides valuable insights into materials in the far-infrared spectrum.